1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
29 /* Driver for the legacy VirtIO PCI interface. */
44 #include <dev/pci/pcivar.h>
45 #include <dev/pci/pcireg.h>
47 #include <dev/virtio/virtio.h>
48 #include <dev/virtio/virtqueue.h>
49 #include <dev/virtio/pci/virtio_pci.h>
50 #include <dev/virtio/pci/virtio_pci_legacy_var.h>
112     VIRTIO_PCI_CONFIG_OFF(vtpci_is_msix_enabled(&(_sc)->vtpci_common))
115     bus_read_1((sc)->vtpci_res, (o))
117     bus_write_1((sc)->vtpci_res, (o), (v))
119  * VirtIO specifies that PCI Configuration area is guest endian. However,
120  * since PCI devices are inherently little-endian, on big-endian systems
121  * the bus layer transparently converts it to BE. For virtio-legacy, this
125     le16toh(bus_read_2((sc)->vtpci_res, (o)))
127     le32toh(bus_read_4((sc)->vtpci_res, (o)))
129     bus_write_2((sc)->vtpci_res, (o), (htole16(v)))
131     bus_write_4((sc)->vtpci_res, (o), (htole32(v)))
132 /* PCI Header LE. On BE systems the bus layer takes care of byte swapping. */
134     bus_read_2((sc)->vtpci_res, (o))
136     bus_read_4((sc)->vtpci_res, (o))
138     bus_write_2((sc)->vtpci_res, (o), (v))
140     bus_write_4((sc)->vtpci_res, (o), (v))
158 	/* VirtIO PCI interface. */
167 	/* VirtIO bus interface. */
188 DRIVER_MODULE(virtio_pci_legacy, pci, vtpci_legacy_driver, 0, 0);
209 	device_set_descf(dev, "VirtIO PCI (legacy) %s adapter", name);  in vtpci_legacy_probe()
211 	/* Prefer transitional modern VirtIO PCI. */  in vtpci_legacy_probe()
222 	sc->vtpci_dev = dev;  in vtpci_legacy_attach()
223 	vtpci_init(&sc->vtpci_common, dev, false);  in vtpci_legacy_attach()
231 	if (vtpci_is_msix_available(&sc->vtpci_common) &&  in vtpci_legacy_attach()
233 		device_printf(dev, "cannot setup MSI-x resources\n");  in vtpci_legacy_attach()
243 	error = vtpci_add_child(&sc->vtpci_common);  in vtpci_legacy_attach()
266 	error = vtpci_delete_child(&sc->vtpci_common);  in vtpci_legacy_detach()
313 	vtpci_child_detached(&sc->vtpci_common);  in vtpci_legacy_child_detached()
327 	cn = &sc->vtpci_common;  in vtpci_legacy_read_ivar()
350 	cn = &sc->vtpci_common;  in vtpci_legacy_write_ivar()
372 	features = vtpci_negotiate_features(&sc->vtpci_common,  in vtpci_legacy_negotiate_features()
386 	return (vtpci_with_feature(&sc->vtpci_common, feature));  in vtpci_legacy_with_feature()
397 	cn = &sc->vtpci_common;  in vtpci_legacy_alloc_virtqueues()
409 	return (vtpci_setup_interrupts(&sc->vtpci_common, type));  in vtpci_legacy_setup_interrupts()
426 	cn = &sc->vtpci_common;  in vtpci_legacy_reinit()
536 	dev = sc->vtpci_dev;  in vtpci_legacy_setup_msix()
540 		sc->vtpci_msix_table_res = bus_alloc_resource_any(  in vtpci_legacy_setup_msix()
542 		if (sc->vtpci_msix_table_res == NULL)  in vtpci_legacy_setup_msix()
548 		sc->vtpci_msix_pba_res = bus_alloc_resource_any(  in vtpci_legacy_setup_msix()
550 		if (sc->vtpci_msix_pba_res == NULL)  in vtpci_legacy_setup_msix()
562 	dev = sc->vtpci_dev;  in vtpci_legacy_teardown_msix()
564 	if (sc->vtpci_msix_pba_res != NULL) {  in vtpci_legacy_teardown_msix()
566 		    rman_get_rid(sc->vtpci_msix_pba_res),  in vtpci_legacy_teardown_msix()
567 		    sc->vtpci_msix_pba_res);  in vtpci_legacy_teardown_msix()
568 		sc->vtpci_msix_pba_res = NULL;  in vtpci_legacy_teardown_msix()
570 	if (sc->vtpci_msix_table_res != NULL) {  in vtpci_legacy_teardown_msix()
572 		    rman_get_rid(sc->vtpci_msix_table_res),  in vtpci_legacy_teardown_msix()
573 		    sc->vtpci_msix_table_res);  in vtpci_legacy_teardown_msix()
574 		sc->vtpci_msix_table_res = NULL;  in vtpci_legacy_teardown_msix()
585 	dev = sc->vtpci_dev;  in vtpci_legacy_alloc_resources()
593 		sc->vtpci_res_type = res_types[i];  in vtpci_legacy_alloc_resources()
594 		sc->vtpci_res = bus_alloc_resource_any(dev, res_types[i], &rid,  in vtpci_legacy_alloc_resources()
596 		if (sc->vtpci_res != NULL)  in vtpci_legacy_alloc_resources()
599 	if (sc->vtpci_res == NULL)  in vtpci_legacy_alloc_resources()
610 	dev = sc->vtpci_dev;  in vtpci_legacy_free_resources()
612 	if (sc->vtpci_res != NULL) {  in vtpci_legacy_free_resources()
613 		bus_release_resource(dev, sc->vtpci_res_type, PCIR_BAR(0),  in vtpci_legacy_free_resources()
614 		    sc->vtpci_res);  in vtpci_legacy_free_resources()
615 		sc->vtpci_res = NULL;  in vtpci_legacy_free_resources()
624 	dev = sc->vtpci_dev;  in vtpci_legacy_probe_and_attach_child()
625 	child = vtpci_child_device(&sc->vtpci_common);  in vtpci_legacy_probe_and_attach_child()
653 		vector = intr->vti_rid - 1;  in vtpci_legacy_register_msix()